Flight Changi Airport departs from Singapore Changi Airport at 08:20 and arrives at Taipei Taoyuan International Airport at 13:10.
The flighttime is about 4h 50m. The distance travelled ("as the bird flies"): 2134 Km. So the average speed is roughly 442 Km.
The best day to arrive at Singapore is Tuesday and it would be best to avoid Thursday, as prices are on average 60.63% higher than on Tuesday. (Average prices, based on 648881 datapoints.)
We have a lot more statistics for flights SQ 876 and between Singapore and Taipei.